| 제목 |
DME 예혼합 압축 착화 엔진에서 밸브 양정과 개폐시기가 내부 배기가스 재순환과 연소에 미치는 영향 |
| 분야 |
전기동력자동차 |
| 언어 |
Korean |
| 저자 |
장진영(한국과학기술원), 배충식(한국과학기술원) |
| Key Words |
DME(dimethyl ether), HCCI(homogeneous charge compression ignition; 예혼합 압축 착화), IEGR(internal EGR; 내부 배기가스 재순환), Residual Gas(잔류가스), VVA(variable valve timing; 가변 밸브 타이밍) |
| 초록 |
Intake/exhaust valve timing and exhaust cam lift were changed to control the internal exhaust gas{{br}}recirculation (IEGR) and combustion phase of homogeneous charge compression ignition (HCCI) engine. To measure the IEGR rate, in-cylinder gas was sampled during from intake valve close to before ignition start. The lower exhaust cam made shorter valve event than higher exhaust cam and made IEGR increase because of trapping the exhaust gas. IEGR rate was more affected by exhaust valve timing than intake valve timing and increased as exhaust valve timing advanced. In-cylinder pressure was increased near top dead center due to early close of exhaust valve. Ignition timing was more affected by intake valve timing than exhaust valve timing in case of exhaust valve lift 8.4 mm, while ignition timing was affected by both intake and exhaust valve timing in case of exhaust valve 2.5 mm. Burn duration with exhaust valve lift 2.5 mm was longer than other case due to higher IEGR rate. The fuel conversion efficiency with higher exhaust valve lift was higher than that with lower exhaust valve lift. The late exhaust and intake maximum open point (MOP) made the fuel conversion efficiency improve. |
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